Doppler imaging of BD+22 deg4409 (LO Peg) using least-squares deconvolution

TA Lister, Andrew Collier Cameron, J Bartus

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We present maximum-entropy reconstructions of the rapidly rotating dwarf single star BD+22 degrees 4409 (LO Peg) from observations at the William Herschel Telescope in 1993 August. Since this star is too faint to use the conventional single- or three-line Doppler imaging methods, we make use of the novel method of least-squares deconvolution, which utilizes the large number of photospheric lines in an echelle spectrum to produce a single high signal-to-noise ratio profile.

The star-spot distributions from the image reconstructions show cool features at both high and low latitudes, in contradiction to recent theoretical predictions of the dynamo behaviour in rapidly rotating stars. Cross-correlation of the images from consecutive nights shows a good correlation from the small-scale structures, but no evidence of surface differential rotation. From the cross-correlation of the high-latitude spot we are able to reject the period of 9.22 h of Jeffries et al. in favour of their preferred period of 10.17 h, confirming the result of Robb & Cardinal.

Original languageEnglish
Pages (from-to)pp.685-694.
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume307
Issue number3
Publication statusPublished - 11 Aug 1999

Keywords

  • line : profiles
  • techniques : image processing
  • stars : activity
  • stars : atmospheres
  • stars : individual : BD+22 degrees 4409
  • stars : late-type
  • MAIN-SEQUENCE STARS
  • AB-DORADUS
  • ACTIVE STARS
  • SURFACE
  • PHOTOMETRY
  • EVOLUTION
  • ROTATION
  • SPOTS
  • LINE

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